Abstract: An apparatus is provided for injecting a conditioning fluid into a soil foundation. The apparatus is light in weight and easy to handle, performs fixing, moving and boring work while requiring not much time, and is excellent in working performance. The apparatus for injecting the conditioning fluid includes a boring machine for boring the soil foundation and injecting the soil conditioning fluid into the soil foundation for hardening. Magnet fixtures secure the boring machine to a magnetic wall surface supporting the soil foundation or to a magnetic wall surface mounted on a member supporting the soil foundation. Further, a control panel, capable of remotely controlling switch valves for water and conditioning fluid in this kind of apparatus, is formed as a separate body from the apparatus body.